Urothelial
Papilloma
Epidemiology:
- 1% of bladder
tumours
- Most commonly seen
in younger patients
Common sites:
Gross features:
- small (0.5-2.0cm)
- delicate papillary
structure attached to mucosa by a stalk
Histologic features:
- true papillae
covered with histologically normal urothelium
- polarity
maintained
- intact umbrella
cell layer
- no more than 7-8
cell layers
- mitoses rare
- inverted
papilloma:
- anastomosing
cords of bland urothelium extending into lamina propria
Immunophenotype:
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Marker:
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Sensitivity:
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Specificity:
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Molecular features:
Other features:
References: